1 /*
2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
3  * Copyright (c) 2005, 2006, 2007, 2008 Mellanox Technologies. All rights reserved.
4  * Copyright (c) 2006, 2007 Cisco Systems, Inc.  All rights reserved.
5  *
6  * This software is available to you under a choice of one of two
7  * licenses.  You may choose to be licensed under the terms of the GNU
8  * General Public License (GPL) Version 2, available from the file
9  * COPYING in the main directory of this source tree, or the
10  * OpenIB.org BSD license below:
11  *
12  *     Redistribution and use in source and binary forms, with or
13  *     without modification, are permitted provided that the following
14  *     conditions are met:
15  *
16  *      - Redistributions of source code must retain the above
17  *        copyright notice, this list of conditions and the following
18  *        disclaimer.
19  *
20  *      - Redistributions in binary form must reproduce the above
21  *        copyright notice, this list of conditions and the following
22  *        disclaimer in the documentation and/or other materials
23  *        provided with the distribution.
24  *
25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32  * SOFTWARE.
33  */
34 
35 #include <linux/errno.h>
36 #include <linux/export.h>
37 #include <linux/slab.h>
38 #include <linux/kernel.h>
39 #include <linux/vmalloc.h>
40 
41 #include <linux/mlx4/cmd.h>
42 
43 #include "mlx4.h"
44 #include "icm.h"
45 
46 static u32 mlx4_buddy_alloc(struct mlx4_buddy *buddy, int order)
47 {
48 	int o;
49 	int m;
50 	u32 seg;
51 
52 	spin_lock(&buddy->lock);
53 
54 	for (o = order; o <= buddy->max_order; ++o)
55 		if (buddy->num_free[o]) {
56 			m = 1 << (buddy->max_order - o);
57 			seg = find_first_bit(buddy->bits[o], m);
58 			if (seg < m)
59 				goto found;
60 		}
61 
62 	spin_unlock(&buddy->lock);
63 	return -1;
64 
65  found:
66 	clear_bit(seg, buddy->bits[o]);
67 	--buddy->num_free[o];
68 
69 	while (o > order) {
70 		--o;
71 		seg <<= 1;
72 		set_bit(seg ^ 1, buddy->bits[o]);
73 		++buddy->num_free[o];
74 	}
75 
76 	spin_unlock(&buddy->lock);
77 
78 	seg <<= order;
79 
80 	return seg;
81 }
82 
83 static void mlx4_buddy_free(struct mlx4_buddy *buddy, u32 seg, int order)
84 {
85 	seg >>= order;
86 
87 	spin_lock(&buddy->lock);
88 
89 	while (test_bit(seg ^ 1, buddy->bits[order])) {
90 		clear_bit(seg ^ 1, buddy->bits[order]);
91 		--buddy->num_free[order];
92 		seg >>= 1;
93 		++order;
94 	}
95 
96 	set_bit(seg, buddy->bits[order]);
97 	++buddy->num_free[order];
98 
99 	spin_unlock(&buddy->lock);
100 }
101 
102 static int mlx4_buddy_init(struct mlx4_buddy *buddy, int max_order)
103 {
104 	int i, s;
105 
106 	buddy->max_order = max_order;
107 	spin_lock_init(&buddy->lock);
108 
109 	buddy->bits = kcalloc(buddy->max_order + 1, sizeof(long *),
110 			      GFP_KERNEL);
111 	buddy->num_free = kcalloc(buddy->max_order + 1, sizeof(*buddy->num_free),
112 				  GFP_KERNEL);
113 	if (!buddy->bits || !buddy->num_free)
114 		goto err_out;
115 
116 	for (i = 0; i <= buddy->max_order; ++i) {
117 		s = BITS_TO_LONGS(1UL << (buddy->max_order - i));
118 		buddy->bits[i] = kvmalloc_array(s, sizeof(long), GFP_KERNEL | __GFP_ZERO);
119 		if (!buddy->bits[i])
120 			goto err_out_free;
121 	}
122 
123 	set_bit(0, buddy->bits[buddy->max_order]);
124 	buddy->num_free[buddy->max_order] = 1;
125 
126 	return 0;
127 
128 err_out_free:
129 	for (i = 0; i <= buddy->max_order; ++i)
130 		kvfree(buddy->bits[i]);
131 
132 err_out:
133 	kfree(buddy->bits);
134 	kfree(buddy->num_free);
135 
136 	return -ENOMEM;
137 }
138 
139 static void mlx4_buddy_cleanup(struct mlx4_buddy *buddy)
140 {
141 	int i;
142 
143 	for (i = 0; i <= buddy->max_order; ++i)
144 		kvfree(buddy->bits[i]);
145 
146 	kfree(buddy->bits);
147 	kfree(buddy->num_free);
148 }
149 
150 u32 __mlx4_alloc_mtt_range(struct mlx4_dev *dev, int order)
151 {
152 	struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
153 	u32 seg;
154 	int seg_order;
155 	u32 offset;
156 
157 	seg_order = max_t(int, order - log_mtts_per_seg, 0);
158 
159 	seg = mlx4_buddy_alloc(&mr_table->mtt_buddy, seg_order);
160 	if (seg == -1)
161 		return -1;
162 
163 	offset = seg * (1 << log_mtts_per_seg);
164 
165 	if (mlx4_table_get_range(dev, &mr_table->mtt_table, offset,
166 				 offset + (1 << order) - 1)) {
167 		mlx4_buddy_free(&mr_table->mtt_buddy, seg, seg_order);
168 		return -1;
169 	}
170 
171 	return offset;
172 }
173 
174 static u32 mlx4_alloc_mtt_range(struct mlx4_dev *dev, int order)
175 {
176 	u64 in_param = 0;
177 	u64 out_param;
178 	int err;
179 
180 	if (mlx4_is_mfunc(dev)) {
181 		set_param_l(&in_param, order);
182 		err = mlx4_cmd_imm(dev, in_param, &out_param, RES_MTT,
183 						       RES_OP_RESERVE_AND_MAP,
184 						       MLX4_CMD_ALLOC_RES,
185 						       MLX4_CMD_TIME_CLASS_A,
186 						       MLX4_CMD_WRAPPED);
187 		if (err)
188 			return -1;
189 		return get_param_l(&out_param);
190 	}
191 	return __mlx4_alloc_mtt_range(dev, order);
192 }
193 
194 int mlx4_mtt_init(struct mlx4_dev *dev, int npages, int page_shift,
195 		  struct mlx4_mtt *mtt)
196 {
197 	int i;
198 
199 	if (!npages) {
200 		mtt->order      = -1;
201 		mtt->page_shift = MLX4_ICM_PAGE_SHIFT;
202 		return 0;
203 	} else
204 		mtt->page_shift = page_shift;
205 
206 	for (mtt->order = 0, i = 1; i < npages; i <<= 1)
207 		++mtt->order;
208 
209 	mtt->offset = mlx4_alloc_mtt_range(dev, mtt->order);
210 	if (mtt->offset == -1)
211 		return -ENOMEM;
212 
213 	return 0;
214 }
215 EXPORT_SYMBOL_GPL(mlx4_mtt_init);
216 
217 void __mlx4_free_mtt_range(struct mlx4_dev *dev, u32 offset, int order)
218 {
219 	u32 first_seg;
220 	int seg_order;
221 	struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
222 
223 	seg_order = max_t(int, order - log_mtts_per_seg, 0);
224 	first_seg = offset / (1 << log_mtts_per_seg);
225 
226 	mlx4_buddy_free(&mr_table->mtt_buddy, first_seg, seg_order);
227 	mlx4_table_put_range(dev, &mr_table->mtt_table, offset,
228 			     offset + (1 << order) - 1);
229 }
230 
231 static void mlx4_free_mtt_range(struct mlx4_dev *dev, u32 offset, int order)
232 {
233 	u64 in_param = 0;
234 	int err;
235 
236 	if (mlx4_is_mfunc(dev)) {
237 		set_param_l(&in_param, offset);
238 		set_param_h(&in_param, order);
239 		err = mlx4_cmd(dev, in_param, RES_MTT, RES_OP_RESERVE_AND_MAP,
240 						       MLX4_CMD_FREE_RES,
241 						       MLX4_CMD_TIME_CLASS_A,
242 						       MLX4_CMD_WRAPPED);
243 		if (err)
244 			mlx4_warn(dev, "Failed to free mtt range at:%d order:%d\n",
245 				  offset, order);
246 		return;
247 	}
248 	__mlx4_free_mtt_range(dev, offset, order);
249 }
250 
251 void mlx4_mtt_cleanup(struct mlx4_dev *dev, struct mlx4_mtt *mtt)
252 {
253 	if (mtt->order < 0)
254 		return;
255 
256 	mlx4_free_mtt_range(dev, mtt->offset, mtt->order);
257 }
258 EXPORT_SYMBOL_GPL(mlx4_mtt_cleanup);
259 
260 u64 mlx4_mtt_addr(struct mlx4_dev *dev, struct mlx4_mtt *mtt)
261 {
262 	return (u64) mtt->offset * dev->caps.mtt_entry_sz;
263 }
264 EXPORT_SYMBOL_GPL(mlx4_mtt_addr);
265 
266 static u32 hw_index_to_key(u32 ind)
267 {
268 	return (ind >> 24) | (ind << 8);
269 }
270 
271 static u32 key_to_hw_index(u32 key)
272 {
273 	return (key << 24) | (key >> 8);
274 }
275 
276 static int mlx4_SW2HW_MPT(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
277 			  int mpt_index)
278 {
279 	return mlx4_cmd(dev, mailbox->dma, mpt_index,
280 			0, MLX4_CMD_SW2HW_MPT, MLX4_CMD_TIME_CLASS_B,
281 			MLX4_CMD_WRAPPED);
282 }
283 
284 static int mlx4_HW2SW_MPT(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
285 			  int mpt_index)
286 {
287 	return mlx4_cmd_box(dev, 0, mailbox ? mailbox->dma : 0, mpt_index,
288 			    !mailbox, MLX4_CMD_HW2SW_MPT,
289 			    MLX4_CMD_TIME_CLASS_B, MLX4_CMD_WRAPPED);
290 }
291 
292 /* Must protect against concurrent access */
293 int mlx4_mr_hw_get_mpt(struct mlx4_dev *dev, struct mlx4_mr *mmr,
294 		       struct mlx4_mpt_entry ***mpt_entry)
295 {
296 	int err;
297 	int key = key_to_hw_index(mmr->key) & (dev->caps.num_mpts - 1);
298 	struct mlx4_cmd_mailbox *mailbox = NULL;
299 
300 	if (mmr->enabled != MLX4_MPT_EN_HW)
301 		return -EINVAL;
302 
303 	err = mlx4_HW2SW_MPT(dev, NULL, key);
304 	if (err) {
305 		mlx4_warn(dev, "HW2SW_MPT failed (%d).", err);
306 		mlx4_warn(dev, "Most likely the MR has MWs bound to it.\n");
307 		return err;
308 	}
309 
310 	mmr->enabled = MLX4_MPT_EN_SW;
311 
312 	if (!mlx4_is_mfunc(dev)) {
313 		**mpt_entry = mlx4_table_find(
314 				&mlx4_priv(dev)->mr_table.dmpt_table,
315 				key, NULL);
316 	} else {
317 		mailbox = mlx4_alloc_cmd_mailbox(dev);
318 		if (IS_ERR(mailbox))
319 			return PTR_ERR(mailbox);
320 
321 		err = mlx4_cmd_box(dev, 0, mailbox->dma, key,
322 				   0, MLX4_CMD_QUERY_MPT,
323 				   MLX4_CMD_TIME_CLASS_B,
324 				   MLX4_CMD_WRAPPED);
325 		if (err)
326 			goto free_mailbox;
327 
328 		*mpt_entry = (struct mlx4_mpt_entry **)&mailbox->buf;
329 	}
330 
331 	if (!(*mpt_entry) || !(**mpt_entry)) {
332 		err = -ENOMEM;
333 		goto free_mailbox;
334 	}
335 
336 	return 0;
337 
338 free_mailbox:
339 	mlx4_free_cmd_mailbox(dev, mailbox);
340 	return err;
341 }
342 EXPORT_SYMBOL_GPL(mlx4_mr_hw_get_mpt);
343 
344 int mlx4_mr_hw_write_mpt(struct mlx4_dev *dev, struct mlx4_mr *mmr,
345 			 struct mlx4_mpt_entry **mpt_entry)
346 {
347 	int err;
348 
349 	if (!mlx4_is_mfunc(dev)) {
350 		/* Make sure any changes to this entry are flushed */
351 		wmb();
352 
353 		*(u8 *)(*mpt_entry) = MLX4_MPT_STATUS_HW;
354 
355 		/* Make sure the new status is written */
356 		wmb();
357 
358 		err = mlx4_SYNC_TPT(dev);
359 	} else {
360 		int key = key_to_hw_index(mmr->key) & (dev->caps.num_mpts - 1);
361 
362 		struct mlx4_cmd_mailbox *mailbox =
363 			container_of((void *)mpt_entry, struct mlx4_cmd_mailbox,
364 				     buf);
365 
366 		(*mpt_entry)->lkey = 0;
367 		err = mlx4_SW2HW_MPT(dev, mailbox, key);
368 	}
369 
370 	if (!err) {
371 		mmr->pd = be32_to_cpu((*mpt_entry)->pd_flags) & MLX4_MPT_PD_MASK;
372 		mmr->enabled = MLX4_MPT_EN_HW;
373 	}
374 	return err;
375 }
376 EXPORT_SYMBOL_GPL(mlx4_mr_hw_write_mpt);
377 
378 void mlx4_mr_hw_put_mpt(struct mlx4_dev *dev,
379 			struct mlx4_mpt_entry **mpt_entry)
380 {
381 	if (mlx4_is_mfunc(dev)) {
382 		struct mlx4_cmd_mailbox *mailbox =
383 			container_of((void *)mpt_entry, struct mlx4_cmd_mailbox,
384 				     buf);
385 		mlx4_free_cmd_mailbox(dev, mailbox);
386 	}
387 }
388 EXPORT_SYMBOL_GPL(mlx4_mr_hw_put_mpt);
389 
390 int mlx4_mr_hw_change_pd(struct mlx4_dev *dev, struct mlx4_mpt_entry *mpt_entry,
391 			 u32 pdn)
392 {
393 	u32 pd_flags = be32_to_cpu(mpt_entry->pd_flags) & ~MLX4_MPT_PD_MASK;
394 	/* The wrapper function will put the slave's id here */
395 	if (mlx4_is_mfunc(dev))
396 		pd_flags &= ~MLX4_MPT_PD_VF_MASK;
397 
398 	mpt_entry->pd_flags = cpu_to_be32(pd_flags |
399 					  (pdn & MLX4_MPT_PD_MASK)
400 					  | MLX4_MPT_PD_FLAG_EN_INV);
401 	return 0;
402 }
403 EXPORT_SYMBOL_GPL(mlx4_mr_hw_change_pd);
404 
405 int mlx4_mr_hw_change_access(struct mlx4_dev *dev,
406 			     struct mlx4_mpt_entry *mpt_entry,
407 			     u32 access)
408 {
409 	u32 flags = (be32_to_cpu(mpt_entry->flags) & ~MLX4_PERM_MASK) |
410 		    (access & MLX4_PERM_MASK);
411 
412 	mpt_entry->flags = cpu_to_be32(flags);
413 	return 0;
414 }
415 EXPORT_SYMBOL_GPL(mlx4_mr_hw_change_access);
416 
417 static int mlx4_mr_alloc_reserved(struct mlx4_dev *dev, u32 mridx, u32 pd,
418 			   u64 iova, u64 size, u32 access, int npages,
419 			   int page_shift, struct mlx4_mr *mr)
420 {
421 	mr->iova       = iova;
422 	mr->size       = size;
423 	mr->pd	       = pd;
424 	mr->access     = access;
425 	mr->enabled    = MLX4_MPT_DISABLED;
426 	mr->key	       = hw_index_to_key(mridx);
427 
428 	return mlx4_mtt_init(dev, npages, page_shift, &mr->mtt);
429 }
430 
431 static int mlx4_WRITE_MTT(struct mlx4_dev *dev,
432 			  struct mlx4_cmd_mailbox *mailbox,
433 			  int num_entries)
434 {
435 	return mlx4_cmd(dev, mailbox->dma, num_entries, 0, MLX4_CMD_WRITE_MTT,
436 			MLX4_CMD_TIME_CLASS_A,  MLX4_CMD_WRAPPED);
437 }
438 
439 int __mlx4_mpt_reserve(struct mlx4_dev *dev)
440 {
441 	struct mlx4_priv *priv = mlx4_priv(dev);
442 
443 	return mlx4_bitmap_alloc(&priv->mr_table.mpt_bitmap);
444 }
445 
446 static int mlx4_mpt_reserve(struct mlx4_dev *dev)
447 {
448 	u64 out_param;
449 
450 	if (mlx4_is_mfunc(dev)) {
451 		if (mlx4_cmd_imm(dev, 0, &out_param, RES_MPT, RES_OP_RESERVE,
452 				   MLX4_CMD_ALLOC_RES,
453 				   MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED))
454 			return -1;
455 		return get_param_l(&out_param);
456 	}
457 	return  __mlx4_mpt_reserve(dev);
458 }
459 
460 void __mlx4_mpt_release(struct mlx4_dev *dev, u32 index)
461 {
462 	struct mlx4_priv *priv = mlx4_priv(dev);
463 
464 	mlx4_bitmap_free(&priv->mr_table.mpt_bitmap, index, MLX4_NO_RR);
465 }
466 
467 static void mlx4_mpt_release(struct mlx4_dev *dev, u32 index)
468 {
469 	u64 in_param = 0;
470 
471 	if (mlx4_is_mfunc(dev)) {
472 		set_param_l(&in_param, index);
473 		if (mlx4_cmd(dev, in_param, RES_MPT, RES_OP_RESERVE,
474 			       MLX4_CMD_FREE_RES,
475 			       MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED))
476 			mlx4_warn(dev, "Failed to release mr index:%d\n",
477 				  index);
478 		return;
479 	}
480 	__mlx4_mpt_release(dev, index);
481 }
482 
483 int __mlx4_mpt_alloc_icm(struct mlx4_dev *dev, u32 index)
484 {
485 	struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
486 
487 	return mlx4_table_get(dev, &mr_table->dmpt_table, index);
488 }
489 
490 static int mlx4_mpt_alloc_icm(struct mlx4_dev *dev, u32 index)
491 {
492 	u64 param = 0;
493 
494 	if (mlx4_is_mfunc(dev)) {
495 		set_param_l(&param, index);
496 		return mlx4_cmd_imm(dev, param, &param, RES_MPT, RES_OP_MAP_ICM,
497 							MLX4_CMD_ALLOC_RES,
498 							MLX4_CMD_TIME_CLASS_A,
499 							MLX4_CMD_WRAPPED);
500 	}
501 	return __mlx4_mpt_alloc_icm(dev, index);
502 }
503 
504 void __mlx4_mpt_free_icm(struct mlx4_dev *dev, u32 index)
505 {
506 	struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
507 
508 	mlx4_table_put(dev, &mr_table->dmpt_table, index);
509 }
510 
511 static void mlx4_mpt_free_icm(struct mlx4_dev *dev, u32 index)
512 {
513 	u64 in_param = 0;
514 
515 	if (mlx4_is_mfunc(dev)) {
516 		set_param_l(&in_param, index);
517 		if (mlx4_cmd(dev, in_param, RES_MPT, RES_OP_MAP_ICM,
518 			     MLX4_CMD_FREE_RES, MLX4_CMD_TIME_CLASS_A,
519 			     MLX4_CMD_WRAPPED))
520 			mlx4_warn(dev, "Failed to free icm of mr index:%d\n",
521 				  index);
522 		return;
523 	}
524 	return __mlx4_mpt_free_icm(dev, index);
525 }
526 
527 int mlx4_mr_alloc(struct mlx4_dev *dev, u32 pd, u64 iova, u64 size, u32 access,
528 		  int npages, int page_shift, struct mlx4_mr *mr)
529 {
530 	u32 index;
531 	int err;
532 
533 	index = mlx4_mpt_reserve(dev);
534 	if (index == -1)
535 		return -ENOMEM;
536 
537 	err = mlx4_mr_alloc_reserved(dev, index, pd, iova, size,
538 				     access, npages, page_shift, mr);
539 	if (err)
540 		mlx4_mpt_release(dev, index);
541 
542 	return err;
543 }
544 EXPORT_SYMBOL_GPL(mlx4_mr_alloc);
545 
546 static int mlx4_mr_free_reserved(struct mlx4_dev *dev, struct mlx4_mr *mr)
547 {
548 	int err;
549 
550 	if (mr->enabled == MLX4_MPT_EN_HW) {
551 		err = mlx4_HW2SW_MPT(dev, NULL,
552 				     key_to_hw_index(mr->key) &
553 				     (dev->caps.num_mpts - 1));
554 		if (err) {
555 			mlx4_warn(dev, "HW2SW_MPT failed (%d), MR has MWs bound to it\n",
556 				  err);
557 			return err;
558 		}
559 
560 		mr->enabled = MLX4_MPT_EN_SW;
561 	}
562 	mlx4_mtt_cleanup(dev, &mr->mtt);
563 
564 	return 0;
565 }
566 
567 int mlx4_mr_free(struct mlx4_dev *dev, struct mlx4_mr *mr)
568 {
569 	int ret;
570 
571 	ret = mlx4_mr_free_reserved(dev, mr);
572 	if (ret)
573 		return ret;
574 	if (mr->enabled)
575 		mlx4_mpt_free_icm(dev, key_to_hw_index(mr->key));
576 	mlx4_mpt_release(dev, key_to_hw_index(mr->key));
577 
578 	return 0;
579 }
580 EXPORT_SYMBOL_GPL(mlx4_mr_free);
581 
582 void mlx4_mr_rereg_mem_cleanup(struct mlx4_dev *dev, struct mlx4_mr *mr)
583 {
584 	mlx4_mtt_cleanup(dev, &mr->mtt);
585 	mr->mtt.order = -1;
586 }
587 EXPORT_SYMBOL_GPL(mlx4_mr_rereg_mem_cleanup);
588 
589 int mlx4_mr_rereg_mem_write(struct mlx4_dev *dev, struct mlx4_mr *mr,
590 			    u64 iova, u64 size, int npages,
591 			    int page_shift, struct mlx4_mpt_entry *mpt_entry)
592 {
593 	int err;
594 
595 	err = mlx4_mtt_init(dev, npages, page_shift, &mr->mtt);
596 	if (err)
597 		return err;
598 
599 	mpt_entry->start       = cpu_to_be64(iova);
600 	mpt_entry->length      = cpu_to_be64(size);
601 	mpt_entry->entity_size = cpu_to_be32(page_shift);
602 	mpt_entry->flags    &= ~(cpu_to_be32(MLX4_MPT_FLAG_FREE |
603 					   MLX4_MPT_FLAG_SW_OWNS));
604 	if (mr->mtt.order < 0) {
605 		mpt_entry->flags |= cpu_to_be32(MLX4_MPT_FLAG_PHYSICAL);
606 		mpt_entry->mtt_addr = 0;
607 	} else {
608 		mpt_entry->mtt_addr = cpu_to_be64(mlx4_mtt_addr(dev,
609 						  &mr->mtt));
610 		if (mr->mtt.page_shift == 0)
611 			mpt_entry->mtt_sz    = cpu_to_be32(1 << mr->mtt.order);
612 	}
613 	if (mr->mtt.order >= 0 && mr->mtt.page_shift == 0) {
614 		/* fast register MR in free state */
615 		mpt_entry->flags    |= cpu_to_be32(MLX4_MPT_FLAG_FREE);
616 		mpt_entry->pd_flags |= cpu_to_be32(MLX4_MPT_PD_FLAG_FAST_REG |
617 						   MLX4_MPT_PD_FLAG_RAE);
618 	} else {
619 		mpt_entry->flags    |= cpu_to_be32(MLX4_MPT_FLAG_SW_OWNS);
620 	}
621 	mr->enabled = MLX4_MPT_EN_SW;
622 
623 	return 0;
624 }
625 EXPORT_SYMBOL_GPL(mlx4_mr_rereg_mem_write);
626 
627 int mlx4_mr_enable(struct mlx4_dev *dev, struct mlx4_mr *mr)
628 {
629 	struct mlx4_cmd_mailbox *mailbox;
630 	struct mlx4_mpt_entry *mpt_entry;
631 	int err;
632 
633 	err = mlx4_mpt_alloc_icm(dev, key_to_hw_index(mr->key));
634 	if (err)
635 		return err;
636 
637 	mailbox = mlx4_alloc_cmd_mailbox(dev);
638 	if (IS_ERR(mailbox)) {
639 		err = PTR_ERR(mailbox);
640 		goto err_table;
641 	}
642 	mpt_entry = mailbox->buf;
643 	mpt_entry->flags = cpu_to_be32(MLX4_MPT_FLAG_MIO	 |
644 				       MLX4_MPT_FLAG_REGION	 |
645 				       mr->access);
646 
647 	mpt_entry->key	       = cpu_to_be32(key_to_hw_index(mr->key));
648 	mpt_entry->pd_flags    = cpu_to_be32(mr->pd | MLX4_MPT_PD_FLAG_EN_INV);
649 	mpt_entry->start       = cpu_to_be64(mr->iova);
650 	mpt_entry->length      = cpu_to_be64(mr->size);
651 	mpt_entry->entity_size = cpu_to_be32(mr->mtt.page_shift);
652 
653 	if (mr->mtt.order < 0) {
654 		mpt_entry->flags |= cpu_to_be32(MLX4_MPT_FLAG_PHYSICAL);
655 		mpt_entry->mtt_addr = 0;
656 	} else {
657 		mpt_entry->mtt_addr = cpu_to_be64(mlx4_mtt_addr(dev,
658 						  &mr->mtt));
659 	}
660 
661 	if (mr->mtt.order >= 0 && mr->mtt.page_shift == 0) {
662 		/* fast register MR in free state */
663 		mpt_entry->flags    |= cpu_to_be32(MLX4_MPT_FLAG_FREE);
664 		mpt_entry->pd_flags |= cpu_to_be32(MLX4_MPT_PD_FLAG_FAST_REG |
665 						   MLX4_MPT_PD_FLAG_RAE);
666 		mpt_entry->mtt_sz    = cpu_to_be32(1 << mr->mtt.order);
667 	} else {
668 		mpt_entry->flags    |= cpu_to_be32(MLX4_MPT_FLAG_SW_OWNS);
669 	}
670 
671 	err = mlx4_SW2HW_MPT(dev, mailbox,
672 			     key_to_hw_index(mr->key) & (dev->caps.num_mpts - 1));
673 	if (err) {
674 		mlx4_warn(dev, "SW2HW_MPT failed (%d)\n", err);
675 		goto err_cmd;
676 	}
677 	mr->enabled = MLX4_MPT_EN_HW;
678 
679 	mlx4_free_cmd_mailbox(dev, mailbox);
680 
681 	return 0;
682 
683 err_cmd:
684 	mlx4_free_cmd_mailbox(dev, mailbox);
685 
686 err_table:
687 	mlx4_mpt_free_icm(dev, key_to_hw_index(mr->key));
688 	return err;
689 }
690 EXPORT_SYMBOL_GPL(mlx4_mr_enable);
691 
692 static int mlx4_write_mtt_chunk(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
693 				int start_index, int npages, u64 *page_list)
694 {
695 	struct mlx4_priv *priv = mlx4_priv(dev);
696 	__be64 *mtts;
697 	dma_addr_t dma_handle;
698 	int i;
699 
700 	mtts = mlx4_table_find(&priv->mr_table.mtt_table, mtt->offset +
701 			       start_index, &dma_handle);
702 
703 	if (!mtts)
704 		return -ENOMEM;
705 
706 	dma_sync_single_for_cpu(&dev->persist->pdev->dev, dma_handle,
707 				npages * sizeof(u64), DMA_TO_DEVICE);
708 
709 	for (i = 0; i < npages; ++i)
710 		mtts[i] = cpu_to_be64(page_list[i] | MLX4_MTT_FLAG_PRESENT);
711 
712 	dma_sync_single_for_device(&dev->persist->pdev->dev, dma_handle,
713 				   npages * sizeof(u64), DMA_TO_DEVICE);
714 
715 	return 0;
716 }
717 
718 int __mlx4_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
719 		     int start_index, int npages, u64 *page_list)
720 {
721 	int err = 0;
722 	int chunk;
723 	int mtts_per_page;
724 	int max_mtts_first_page;
725 
726 	/* compute how may mtts fit in the first page */
727 	mtts_per_page = PAGE_SIZE / sizeof(u64);
728 	max_mtts_first_page = mtts_per_page - (mtt->offset + start_index)
729 			      % mtts_per_page;
730 
731 	chunk = min_t(int, max_mtts_first_page, npages);
732 
733 	while (npages > 0) {
734 		err = mlx4_write_mtt_chunk(dev, mtt, start_index, chunk, page_list);
735 		if (err)
736 			return err;
737 		npages      -= chunk;
738 		start_index += chunk;
739 		page_list   += chunk;
740 
741 		chunk = min_t(int, mtts_per_page, npages);
742 	}
743 	return err;
744 }
745 
746 int mlx4_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
747 		   int start_index, int npages, u64 *page_list)
748 {
749 	struct mlx4_cmd_mailbox *mailbox = NULL;
750 	__be64 *inbox = NULL;
751 	int chunk;
752 	int err = 0;
753 	int i;
754 
755 	if (mtt->order < 0)
756 		return -EINVAL;
757 
758 	if (mlx4_is_mfunc(dev)) {
759 		mailbox = mlx4_alloc_cmd_mailbox(dev);
760 		if (IS_ERR(mailbox))
761 			return PTR_ERR(mailbox);
762 		inbox = mailbox->buf;
763 
764 		while (npages > 0) {
765 			chunk = min_t(int, MLX4_MAILBOX_SIZE / sizeof(u64) - 2,
766 				      npages);
767 			inbox[0] = cpu_to_be64(mtt->offset + start_index);
768 			inbox[1] = 0;
769 			for (i = 0; i < chunk; ++i)
770 				inbox[i + 2] = cpu_to_be64(page_list[i] |
771 					       MLX4_MTT_FLAG_PRESENT);
772 			err = mlx4_WRITE_MTT(dev, mailbox, chunk);
773 			if (err) {
774 				mlx4_free_cmd_mailbox(dev, mailbox);
775 				return err;
776 			}
777 
778 			npages      -= chunk;
779 			start_index += chunk;
780 			page_list   += chunk;
781 		}
782 		mlx4_free_cmd_mailbox(dev, mailbox);
783 		return err;
784 	}
785 
786 	return __mlx4_write_mtt(dev, mtt, start_index, npages, page_list);
787 }
788 EXPORT_SYMBOL_GPL(mlx4_write_mtt);
789 
790 int mlx4_buf_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
791 		       struct mlx4_buf *buf)
792 {
793 	u64 *page_list;
794 	int err;
795 	int i;
796 
797 	page_list = kcalloc(buf->npages, sizeof(*page_list), GFP_KERNEL);
798 	if (!page_list)
799 		return -ENOMEM;
800 
801 	for (i = 0; i < buf->npages; ++i)
802 		if (buf->nbufs == 1)
803 			page_list[i] = buf->direct.map + (i << buf->page_shift);
804 		else
805 			page_list[i] = buf->page_list[i].map;
806 
807 	err = mlx4_write_mtt(dev, mtt, 0, buf->npages, page_list);
808 
809 	kfree(page_list);
810 	return err;
811 }
812 EXPORT_SYMBOL_GPL(mlx4_buf_write_mtt);
813 
814 int mlx4_mw_alloc(struct mlx4_dev *dev, u32 pd, enum mlx4_mw_type type,
815 		  struct mlx4_mw *mw)
816 {
817 	u32 index;
818 
819 	if ((type == MLX4_MW_TYPE_1 &&
820 	     !(dev->caps.flags & MLX4_DEV_CAP_FLAG_MEM_WINDOW)) ||
821 	     (type == MLX4_MW_TYPE_2 &&
822 	     !(dev->caps.bmme_flags & MLX4_BMME_FLAG_TYPE_2_WIN)))
823 		return -EOPNOTSUPP;
824 
825 	index = mlx4_mpt_reserve(dev);
826 	if (index == -1)
827 		return -ENOMEM;
828 
829 	mw->key	    = hw_index_to_key(index);
830 	mw->pd      = pd;
831 	mw->type    = type;
832 	mw->enabled = MLX4_MPT_DISABLED;
833 
834 	return 0;
835 }
836 EXPORT_SYMBOL_GPL(mlx4_mw_alloc);
837 
838 int mlx4_mw_enable(struct mlx4_dev *dev, struct mlx4_mw *mw)
839 {
840 	struct mlx4_cmd_mailbox *mailbox;
841 	struct mlx4_mpt_entry *mpt_entry;
842 	int err;
843 
844 	err = mlx4_mpt_alloc_icm(dev, key_to_hw_index(mw->key));
845 	if (err)
846 		return err;
847 
848 	mailbox = mlx4_alloc_cmd_mailbox(dev);
849 	if (IS_ERR(mailbox)) {
850 		err = PTR_ERR(mailbox);
851 		goto err_table;
852 	}
853 	mpt_entry = mailbox->buf;
854 
855 	/* Note that the MLX4_MPT_FLAG_REGION bit in mpt_entry->flags is turned
856 	 * off, thus creating a memory window and not a memory region.
857 	 */
858 	mpt_entry->key	       = cpu_to_be32(key_to_hw_index(mw->key));
859 	mpt_entry->pd_flags    = cpu_to_be32(mw->pd);
860 	if (mw->type == MLX4_MW_TYPE_2) {
861 		mpt_entry->flags    |= cpu_to_be32(MLX4_MPT_FLAG_FREE);
862 		mpt_entry->qpn       = cpu_to_be32(MLX4_MPT_QP_FLAG_BOUND_QP);
863 		mpt_entry->pd_flags |= cpu_to_be32(MLX4_MPT_PD_FLAG_EN_INV);
864 	}
865 
866 	err = mlx4_SW2HW_MPT(dev, mailbox,
867 			     key_to_hw_index(mw->key) &
868 			     (dev->caps.num_mpts - 1));
869 	if (err) {
870 		mlx4_warn(dev, "SW2HW_MPT failed (%d)\n", err);
871 		goto err_cmd;
872 	}
873 	mw->enabled = MLX4_MPT_EN_HW;
874 
875 	mlx4_free_cmd_mailbox(dev, mailbox);
876 
877 	return 0;
878 
879 err_cmd:
880 	mlx4_free_cmd_mailbox(dev, mailbox);
881 
882 err_table:
883 	mlx4_mpt_free_icm(dev, key_to_hw_index(mw->key));
884 	return err;
885 }
886 EXPORT_SYMBOL_GPL(mlx4_mw_enable);
887 
888 void mlx4_mw_free(struct mlx4_dev *dev, struct mlx4_mw *mw)
889 {
890 	int err;
891 
892 	if (mw->enabled == MLX4_MPT_EN_HW) {
893 		err = mlx4_HW2SW_MPT(dev, NULL,
894 				     key_to_hw_index(mw->key) &
895 				     (dev->caps.num_mpts - 1));
896 		if (err)
897 			mlx4_warn(dev, "xxx HW2SW_MPT failed (%d)\n", err);
898 
899 		mw->enabled = MLX4_MPT_EN_SW;
900 	}
901 	if (mw->enabled)
902 		mlx4_mpt_free_icm(dev, key_to_hw_index(mw->key));
903 	mlx4_mpt_release(dev, key_to_hw_index(mw->key));
904 }
905 EXPORT_SYMBOL_GPL(mlx4_mw_free);
906 
907 int mlx4_init_mr_table(struct mlx4_dev *dev)
908 {
909 	struct mlx4_priv *priv = mlx4_priv(dev);
910 	struct mlx4_mr_table *mr_table = &priv->mr_table;
911 	int err;
912 
913 	/* Nothing to do for slaves - all MR handling is forwarded
914 	* to the master */
915 	if (mlx4_is_slave(dev))
916 		return 0;
917 
918 	if (!is_power_of_2(dev->caps.num_mpts))
919 		return -EINVAL;
920 
921 	err = mlx4_bitmap_init(&mr_table->mpt_bitmap, dev->caps.num_mpts,
922 			       ~0, dev->caps.reserved_mrws, 0);
923 	if (err)
924 		return err;
925 
926 	err = mlx4_buddy_init(&mr_table->mtt_buddy,
927 			      ilog2((u32)dev->caps.num_mtts /
928 			      (1 << log_mtts_per_seg)));
929 	if (err)
930 		goto err_buddy;
931 
932 	if (dev->caps.reserved_mtts) {
933 		priv->reserved_mtts =
934 			mlx4_alloc_mtt_range(dev,
935 					     fls(dev->caps.reserved_mtts - 1));
936 		if (priv->reserved_mtts < 0) {
937 			mlx4_warn(dev, "MTT table of order %u is too small\n",
938 				  mr_table->mtt_buddy.max_order);
939 			err = -ENOMEM;
940 			goto err_reserve_mtts;
941 		}
942 	}
943 
944 	return 0;
945 
946 err_reserve_mtts:
947 	mlx4_buddy_cleanup(&mr_table->mtt_buddy);
948 
949 err_buddy:
950 	mlx4_bitmap_cleanup(&mr_table->mpt_bitmap);
951 
952 	return err;
953 }
954 
955 void mlx4_cleanup_mr_table(struct mlx4_dev *dev)
956 {
957 	struct mlx4_priv *priv = mlx4_priv(dev);
958 	struct mlx4_mr_table *mr_table = &priv->mr_table;
959 
960 	if (mlx4_is_slave(dev))
961 		return;
962 	if (priv->reserved_mtts >= 0)
963 		mlx4_free_mtt_range(dev, priv->reserved_mtts,
964 				    fls(dev->caps.reserved_mtts - 1));
965 	mlx4_buddy_cleanup(&mr_table->mtt_buddy);
966 	mlx4_bitmap_cleanup(&mr_table->mpt_bitmap);
967 }
968 
969 int mlx4_SYNC_TPT(struct mlx4_dev *dev)
970 {
971 	return mlx4_cmd(dev, 0, 0, 0, MLX4_CMD_SYNC_TPT,
972 			MLX4_CMD_TIME_CLASS_A, MLX4_CMD_NATIVE);
973 }
974 EXPORT_SYMBOL_GPL(mlx4_SYNC_TPT);
975